local str1 = 'hello world'
local str2 = "hello lua"
local str3 = [["add\name",'hello']]
local str4 = [=[string have a [[]].]=]
local a = "one string"
local b = string.gsub(a, "one", "another")

-- long string
page = [[
<html>
<head>
  <title>An HTML Page</title>
</head>
<body>
  <a href="http://www.lua.org">Lua</a>
</body>
</html>
]]
print(page)
print("10" + 1)  -->11
print("10 + 1")  -->10 + 1
print(10 .. 20)  -->1020
	

print(str1)    -->output:hello world
print(str2)    -->output:hello lua
print(#str2)   -->output:9
print(str3)    -->output:"add\name",'hello'
print(str4)    -->output:string have a [[]].
print(a)
print(b)

